Concrete form



'Aug. 17 1926.

J. N. HELTZEL UONCRETE FORM Filed Dec. 3, 1925 Patented Aug. 17, 1926.

UNITED STATES JOHN N. HELTZEL,

OF WARREN, OHIO.

CONCRETE FORM.

Application filed December 3, 1925.

The present invention relates to concrete forms, and aims to provide a novel and improved form to facilitate the construction of concrete slabs or Sections having a space between them, for the purpose of receiving a bituminous, concrete or other suitable filler so as to provide a sealed joint, and, if desired, a traffic line between the slabs, this invention being an improi'ement over the collapsible forms disclosed in my copending application Serial No. 718,376,

filed June 6, 1924.

Another object of the invention is the provision of a simple and inexpensive form 1-5 to'be used at one side or edge of a completed concrete slab, to define the adjacent side or edge of another slab or section un' der construction, in order that said slabs -will be spaced apart.

With the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made within the scope of what is claimed, without departing from'the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein Figure 1 is a perspective view of one of.

the forms in place, showing the slabs in section.

Fig. 2- is a perspective view of the form removed, showing an implement used for withdrawing the form from betweeirthe slabs. i

Fig. 3 is an end View of the form showing the slabs in section.

F ig. 4 is a perspective view illustrating a modification.

The form comprises a vertical plate 10 of suitable length, and of suitable sheet metal, having at its upper edge a horizontal flange 11 extending to one side. The plate 10 is of a height. equal to the depth of the-conorete road or other surfacing structure forwhich theform is used, and the flange 11 is of a width greater than the space to be produced between the slabs or sections.

The plates 12 and 13 are riveted or otherwise secured to that side of the plate 10 below the flange 11, and have the curved leaf springs 14. The plates 12 and 13 nd leaf springs 14 are preferably comparatively wide, although preferably slightly narrower Serial No. 72,961.

than the plate 10. There may be any number of theleaf springs 14 according to the length of the plate 10, and the plate 12 which is located at one end of the plate 10 has a tongue or extension 15 projecting beyond said end of the plate 10 in order to overlap the adjacent end portion of the adjoining plate .10, it being understood that the form plates or members are disposed end to end. The tongue or extension 15-will therefore aid in maintaining the plates 10 in alinement.

The flange 11 has small slots 16 therein ad acent to the plate 10, and said plate has slots 17 therein extending upwardly from its lower edge at suitable longitudinal points, for the purpose which will presently appear.

In the building of a concrete roador other surfacing structure, using the present form, one concrete-slab or section 18 is produced in the usual manner, its sides or edges being defined by the usual side forms or rails (not shown). After the slab 18 has hardened suflioiently the plate 10 is disposed adjacent to the side or edge of the slab 18 along which the other slab 19 is t'o be produced, the form rail having been removed from the slab 18. The plate 10, or a series of them disposed end to end, is positioned so that the flange 11. overlaps the upper surface of the slab 18, with the convex surfaces of the springs -14 bearing against the side or edge of the slab, as seen in Figs. 1 and 3. This spaces the plate 10 from the slab 18. The slab 19 is then produced, and the plate serves as a form member to define the corresponding side or edge of said slab 19, the flange 11 being used to support a screedboardorother implement used for striking off the surface of the concrete in finishing the slab 19. The flange ll closes the space between the slabs, to prevent the concrete from running over into or falling down the space between the slabs, as well as assisting in holding the plate 10 in place during the building of the slab 19. The slots 17' are for the purpose of accommodating tie or dowel rods 20 that are used for tying together the slabs 18 and 19, said rods 20 extending across the space between the slabs.

After the concrete of the slab 19 has set sufficiently, and after the slab 19 has been ed ed 9.1011 the uppe'redge of the plate 10, cal plate 0 is removed from'between the slabs. The yieldin the plate 10' 14 will enable the p ate 10 to be withdrawn from between the slabs without distorting, chipping or breaking the edges of the slabs, which may still be greeminasmuch as the form 1s removed before the concrete has completely hardened. The springs or yielding spacers 14 thus permit the plate 10 to be moved slightly away from the slab 19 in withdrawing the form.

.The slots 16 enable a hook 21 to be used for withdrawing the form from between the slabs, said hook being engaged downwardly through one of the slots 16 under the flange 11, in order that the form may he lifted out of the slot, and, at the same time, the form may be shifted away from the slab 19, by bending the springs or spacers 14, toward the hardened slab 18 and away from the green slab 19, in order that the ;torm may be withdrawn without disturbing or injuring the slab 19.

The forms may be used for producing either longitudinal or transverse joints in concrete roads, and the space between the slabs may be filled with a bituminous filler, concrete of a different color, or other suitable material, for'making awater tight seal between thefslabs, and the filler may also serve as a traflic line extending longitudinally of the road between the opposite slabs.

Fig. 4 illustrates a modification, in that has the flange 11 at its upper edge and has the spring portion or spacer 14: as an integral part thereof, bent back from its lower edge below the flange 11'. The portion 14 is spaced from the plate 10' and extends upwardly to a point near but spaced from the flange 11. The slots 17- "extend upwardly into the plate 10' and portion 14 through the bend between them, and

the portion 14: may yield to enable the form to be withdrawn from. between the slabs without injuring the green slab adjacent to the plate 10'. 9

Having thus described the invention, what is claimed as new is 1. A concrete form ,of the character "described comprising a plate-having a flange at its upper edge to overlap a completed action of the springs below said flange to bear against said slab and space said plate therefrom.

4.. A concrete form ofthe character described comprising a plate of a height equal to the depth of a concrete slab and having .a flangeat its upper edge extending to one side to overlap sald slab, and spacing means below said flange for spacing said plate from the slab. y 1

5. A concrete form of the-character de scribed comprising a plate ofa height equal to the depth of a concrete slab and having a flange at its upper edge extending to one side to overlap said slab, and yieldable spacing means to be disposed between said plate and slab. 6. A 'concrete form of the character described comprising a plate having a flange at its upper edge-to overlap a completed concrete slab, and spacing means to be disposed between said slaband plate.

7. A concrete form of the character scribed comprising a plate having a flange at its up er edge to overlap a completed concrete s ab, said plate having a slot extending upwardly from its lower edge to accomodate a tie rod', and s acing means to be disposed between said p ate and slab.

8. A concrete form of the character de scribed comprising a plate having a flange at its upper edge to overlap a completed concrete slab, sald flange having a slot ad jacent to said plate for the engagement of an implement to lift the plate, and means for spacing said plate from said slab.

In testimony whereof I hereunto aflix my signature.

' JOHN N. HELTZEL. 

